50-Day Java Application Development Roadmap

Duration: 1 Hour Per Day
Outcome: Core Java + Swing GUI + JDBC + Full Desktop Application

Week 1-4: Core Java Foundation - Days 1 to 24

Day	Topic	Key Concepts	Practice Task
1	Setup + First Program	JDK, JRE, JVM, main method	Print name, age, city
2	Variables + Data Types	int, double, char, boolean, String, final	Simple calculator
3	Operators	Arithmetic, Relational, Logical, Ternary	Swap two numbers
4	Input + Output	Scanner class	Cash bill input
5	Decision Making	if-else, switch-case	Grade system
6	Loops	for, while, do-while, break, continue	Multiplication table
7	Mini Project 1	Combine basics	ATM Menu Console App
8	Arrays 1D	Declaration, length, traversal	Find max/min in array
9	Arrays 2D	Matrix	Sum of diagonals
10	Methods	Parameters, return, void	isPrime method
11	Method Overloading	Same name different params	Calculator with overloading
12	Strings	String methods: length, substring, equals	Palindrome checker
13	String Methods	split, trim, toUpperCase	Count words in sentence
14	Mini Project 2	Arrays + Methods	Cash Bill Program with arrays
15	OOP Basics	Class, Object, Constructor, this	Student class
16	Constructors + static	Default, Parameterized, static	BankAccount class
17	Encapsulation	private, getters, setters	Data hiding in Student
18	Inheritance	extends, super	Person to Employee
19	Polymorphism	Method overriding	shape.area override
20	Abstract + Interface	abstract class, interface	Payable interface
21	Mini Project 3	OOP	Law Firm Client System
22	Exception Handling	try-catch-finally, throw, throws	Handle ArithmeticException
23	File + Collections	FileWriter, ArrayList, HashMap	Save bill to bill.txt
24	Revision + Final Core Project	All core topics	Cashbill with OOP + File

Day	Topic	Key Concepts	Practice Task
25	Swing Intro	JFrame, JPanel, setVisible	Create main application window
26	Basic Components	JLabel, JTextField, JButton, JPasswordField	Build Login Form
27	Form Components	JComboBox, JRadioButton, JTextArea, JCheckBox	Client Entry Form
28	Event Handling	ActionListener	Button click to show data
29	Layouts	BorderLayout, GridLayout, FlowLayout	Arrange form in 2 columns
30	JTable	DefaultTableModel, JScrollPane	Display client list in table
31	Menus + Dialogs	JMenuBar, JOptionPane, JFileChooser	File menu with Save and Exit

Database: SQLite. Single file. No server needed.

Day	Topic	Key Concepts	Practice Task
32	JDBC Setup	Connection, DriverManager	Connect to lawfirm.db
33	Create Tables	CREATE TABLE, PreparedStatement	clients, cases, payments tables
34	INSERT + SELECT	executeUpdate, ResultSet	Add and list clients
35	UPDATE + DELETE	WHERE clause, SQL Injection	Update fees, Delete client
36	DAO Pattern	Separate database logic	ClientDAO with CRUD methods
37	Search	LIKE, ORDER BY	Search by name or case type
38	Transactions	setAutoCommit, commit, rollback	Bill and Payment in one transaction

Day	Topic	Key Concepts	Practice Task
39-40	Swing + JDBC Link	Call DAO from GUI	Save form data to database
41	Validation	Input validation	Validate phone and fees
42	Reports	FileWriter, CSV	Generate Bill_101.txt
43	MVC Architecture	Model View Controller	Refactor into packages
44	Multi-Window	Multiple JFrame	Main menu to open forms
45-49	Capstone Project	Full CRUD	Law Firm Management System
50	Deployment	Create JAR file	java -jar LawFirmApp.jar

By Day 50 you will build a complete desktop application.

Tech Stack: Java 17 + Swing + SQLite + JDBC + OOP + MVC